The planet cooled for all the reasons I listed. And did so with a higher radiative forcing value for CO2 than today.
Those are what are called "negative forcings" and sometimes they are larger than positive forcings like CO2.
The reason YOU know ANYTHING about the earth's climate history
is because of the very same research that tells you that the CURRENT warming is NOT dominated by natural forcings.
The bottom line is the earth has a 50 million year track record of cooling itself through natural processes.
I honestly don't know why you think that matters. If you had read ANY of the IPCC you'd note that most of those negative forcings are KNOWN AND DISCUSSED at length. The problem is that they cannot be lined up to explain the warming we see today.
You seem to think that because there are negative forcings and they once aligned in such a way as to be larger than a high CO2 content that somehow human activities can NEVER be more than the negative forcings.
This is simply mathematically ignorant. OF COURSE they can!
In part due to the fact of the earth's unique landmass configuration that affects ocean circulation.
And that landmass configuration has changed and impacted climate before. As for the ocean circulation clearly you are not familiar with the TECHNICAL DETAILS of said circulation.
Specifically isolated polar regions.
So you are of the opinion that this is why human activity cannot warm the globe? Or what, specifically?
Because right now most of the earth's experts in this topic say YOU are wrong.
It's a amazing that you totally dismiss the natural dynamic processes which work to cool the earth.
I have never denied that. I have EXPLICITLY discussed them.
I really am kind of confused how oversimplified you want this all to be. I haven't met many engineers who so easily dismiss complexity of systems that they don't understand very well.
- evaporative cooling, cloud reflection
- decreasing water vapor from cloud formation
- decreasing water vapor in the upper troposphere
- increased heat flow into outer space and increased ocean mixing sequestering extra heat in the deep ocean.
Are you honestly of the opinion that YOU ARE THE FIRST PERSON TO THINK OF THESE FORCINGS? I must again point you to the literature which has discussed these very things for DECADES.
And, again, the earth's experts disagree with you.
Either you are the smartest man to walk the earth or you are mistaken.
What do YOU believe is the case?